Earlier in the summer I posted a concern of a possible leak in my in-ground spa. The "bucket test", however, suggested that no leak was obvious.
Over a 40-day period, I kept a log of the water level in the spa with the auto fill OFF & the cover in place except for about 1 hour daily. The total decrease in the water level was 2". There was no splash out during that period (not even into the auto cover vault).
Therefore, as a result of the bucket test & no evidence of splash out, I can only assume that the decrease in the water level was due solely to evaporation. Am I thinking correctly here? If so, does this amount of water loss due to evaporation seem excessive for a covered 2,500- gallon spa measuring 10' X 14'?
For the past 22 days, the auto fill has been ON. The salt level has fallen from 3,000 ppm to 2,450 ppm (using the Taylor drop test). Does this seem to be consistent with the above assumed evaporation loss?
Do keep in mind that during this 40-day test period, the air temperature has been between 80℉ & 100℉.
As usual, thank you so much for your help & expertise.